The following questions refer to sexual reproduction in both flowering plants and humans - Leaving Cert Biology - Question 6 - 2017
Question 6
The following questions refer to sexual reproduction in both flowering plants and humans.
(a) Which types of cell division occur during production of the female gam... show full transcript
Worked Solution & Example Answer:The following questions refer to sexual reproduction in both flowering plants and humans - Leaving Cert Biology - Question 6 - 2017
Step 1
Which types of cell division occur during production of the female gametes in flowering plants and in humans?
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Answer
In flowering plants: The production of female gametes involves meiosis followed by mitosis. First, meiosis occurs within the ovule, producing megaspores. Following this, mitosis takes place, leading to the formation of the embryo sac.
In humans: Meiosis occurs in the ovaries to produce the female gametes (ova).
Step 2
Give the precise location of the production of the female gametes.
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Answer
In flowering plants: The production of female gametes occurs in the embryo sac, located within the ovule.
In humans: Female gametes are produced in the Graafian follicle (ovary).
Step 3
Give the precise location of fertilisation under normal circumstances.
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Answer
In flowering plants: Fertilisation normally takes place in the ovule, specifically within the embryo sac.
In humans: Fertilisation occurs in the oviduct (Fallopian tube).
Step 4
Name the next stage of development following formation of the zygote.
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In flowering plants: The next stage after zygote formation is the embryo.
In humans: The next stage post-zygotic formation is the morula.
Step 5
Give an advantage and a disadvantage of sexual reproduction in organisms.
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Answer
Advantage: Sexual reproduction leads to increased genetic variation, which can enhance the adaptability of the species.
Disadvantage: It often requires two parents (or difficulty in finding a mate) or results in a longer life cycle, which can complicate reproductive success.
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